Voxyn were savage, aggressive xenomorphs bioengineered by the Yuuzhan Vong to hunt down and kill Jedi. They used genetic information from vornskrs, Force-sensitive predators from Myrkr, mixed with whatever ugly Vong monsters they could find. Voxyn had concentrated acid for blood and could spit acid, had a poisonous barbed tail, and could use Black Canary's "canary cry." (I don't know, maybe the Yuuzhan Vong had Black Canary's DNA stored somewhere.)

Born without a sense of humor? We are inspired by your courageous struggle. …Just kidding. Get the hell out of here and go read Wookiepedia's "real" article on Voxyn.